<!DOCTYPE html>
<html>

<head>
	<meta charset="UTF-8">
	<title></title>
</head>

<body style="margin: 50px;">
	<table border="1" width="1000">
		<tr style="background-color: #999;">
			<th><input type="checkbox"></th>
			<th>分类ID</th>
			<th>分类名称</th>
			<th>分类描述</th>
			<th>操作</th>
		</tr>
		<tr>
			<td align="center"><input type="checkbox" name="chekbox"></td>
			<td>1</td>
			<td>手机数码</td>
			<td>手机数码类商品</td>
			<td><a href="">修改</a>|<a href="">删除</a></td>
		</tr>
		<tr>
			<td align="center"><input type="checkbox" name="chekbox"></td>
			<td>2</td>
			<td>电脑办公</td>
			<td>电脑办公类商品</td>
			<td><a href="">修改</a>|<a href="">删除</a></td>
		</tr>
		<tr>
			<td align="center"><input type="checkbox" name="chekbox"></td>
			<td>3</td>
			<td>鞋靴箱包</td>
			<td>鞋靴箱包类商品</td>
			<td><a href="">修改</a>|<a href="">删除</a></td>
		</tr>
		<tr>
			<td align="center"><input type="checkbox" name="chekbox"></td>
			<td>4</td>
			<td>家居饰品</td>
			<td>家居饰品类商品</td>
			<td><a href="">修改</a>|<a href="">删除</a></td>
		</tr>
	</table>
	<script type="text/javascript">
		let arrRows = document.getElementsByTagName("tr")
		for (i = 0; 0 < arrRows.length; i++) {
			let row = arrRows[i]
			if (i % 2 === 0) {
				row.style.backgroundColor = "blue"
			} else {
				row.style.backgroundColor = "green"
			}
		}
	</script>
</body>

</html>